题目内容
【题目】计算:
(1)(﹣3x2y2)22xy+(xy)5;
(2)(x+y)(x﹣y)﹣x(x+y)+2xy.
【答案】
(1)解:(﹣3x2y2)22xy+(xy)5,
=9x4y42xy+x5y5,
=18x5y5+x5y5,
=19x5y5
(2)解:(x+y)(x﹣y)﹣x(x+y)+2xy,
=x2﹣y2﹣x2﹣xy+2xy,
=﹣y2+xy
【解析】(1)先算乘方,然后再合并同类项即可;(2)先利用平方差和单项式乘以多项式的方法去小括号,然后合并同类项即可.
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